You can usually find purple sweet potatoes at well‑stocked supermarkets, Asian and international grocery stores, local co‑ops, farmers’ markets in season, and a variety of online produce shops.

Quick Scoop: Where to Buy Purple Sweet Potatoes

1. Big supermarkets and natural food chains

Many large chains now carry purple varieties alongside regular sweet potatoes.

  • Natural/organic chains (like Whole Foods–type stores) often stock organic purple sweet potatoes or branded purple varieties in the produce section, near regular sweet potatoes and yams.
  • Check the store’s online product search for “purple sweet potato” or “Stokes Purple” before going in person.
  • Some mainstream supermarkets list them online even if they’re not always visible on the shelf, so asking produce staff helps.

If your usual supermarket has a good organic or “global foods” aisle, that’s one of the first places to look.

2. Asian, Caribbean, and international groceries

Purple sweet potatoes (often labeled Okinawan, Japanese, or just “purple”) are very common in Asian markets.

  • Japanese, Korean, Chinese, Filipino, and broader Asian groceries almost always have some type of purple sweet potato in season.
  • Caribbean or Latin markets sometimes stock them too, especially where root vegetables are popular.
  • Forum users regularly mention Asian supermarkets and specialty import stores as the most reliable places when regular supermarkets are hit‑or‑miss.

Mini‑tip: Bring a photo on your phone; labels vary (Okinawan, ube, purple yam, purple sweet potato), and staff can point you to the right bin.

3. Food co‑ops and farmers’ markets

Community co‑ops and farmers’ markets increasingly carry specialty potatoes, including purple types.

  • Urban food co‑ops and “natural” neighborhood markets often bring in purple sweet potatoes during fall and winter, when demand for roasting and holiday dishes rises.
  • Farmers’ markets in autumn (late summer to early winter) are prime time; growers may sell them by the kilo or bag if you want to stock up.
  • Some shoppers on local forums report finding multiple purple varieties—white‑fleshed Japanese types and fully purple‑fleshed ones—at co‑ops and markets.

If you like buying local and in bulk, a fall market run is often the sweetest (and cheapest) way to load up.

4. Online delivery and specialty produce sites

If local stores are inconsistent, you can order purple sweet potatoes online for home delivery.

  • Fresh‑produce delivery sites and online farm shops sell purple‑fleshed sweet potatoes by the kilogram or by the box.
  • Some list them specifically as “Purple Flesh Sweet Potatoes,” “Purple Sweet Potatoes,” or “Okinawan Sweet Potato.”
  • Local or regional veg‑box companies (weekly farm‑box style) sometimes include them seasonally; check their product listings or request them as a special item.

This route is handy if you live somewhere rural or if you want a larger quantity for meal prep, baking, or restaurant‑style experimenting.

5. A few buying and label tips

Because names can be confusing, here are quick pointers:

  1. Names to look for
    • “Purple sweet potato,” “purple flesh sweet potato,” “Okinawan sweet potato,” “Japanese purple sweet potato,” or branded “Stokes Purple.”
  1. Season and availability
    • Peak season is usually late summer through early winter, so stores and markets are more likely to carry them then.
  1. Texture and use
    • Purple sweet potatoes tend to be denser and drier than orange ones, great for roasting, mashing with coconut milk, and desserts where you want vivid color.

TL;DR:
Search your nearest natural/organic grocery and big supermarket chains, then check Asian/international markets and local co‑ops; if those fail, order from an online produce or farm‑box service that lists “purple sweet potatoes,” “purple flesh sweet potatoes,” “Okinawan sweet potatoes,” or “Stokes Purple.”

Information gathered from public forums or data available on the internet and portrayed here.